Clover Fork Pins for matching seams up.
Quilts! Quilts! Quilts! A good book with patterns and instructions for a variety of techniques.
Ott Light if lighting is an issue for you. Can be purchased inexpensively from Joann's when they have a sale.
Painter's Tape can also be used to remind yourself that a block is a little off and needs to be fixed or carefully sashed later. You just put a little piece of tape on the block.
A spur of the moment fat quarter collection purchase. Fun!